Social and Behavioral Sciences Commons^™

Optical Image Encryption Based On Chaotic Baker Map And Double Random Phase Encoding, Ahmed M. Elshamy, Ahmed N. Z Rashed, Abd El-Naser A. Mohamed, Osama S. Faragalla, Yi Mu, Saleh A. Alshebeili, F E Abd El-Samie

Faculty of Engineering and Information Sciences - Papers: Part A

This paper presents a new technique for optical image encryption based on chaotic Baker map and Double Random Phase Encoding (DRPE). This technique is implemented in two layers to enhance the security level of the classical DRPE. The first layer is a pre-processing layer, which is performed with the chaotic Baker map on the original image. In the second layer, the classical DRPE is utilized. Matlab simulation experiments show that the proposed technique enhances the security level of the DRPE, and at the same time has a better immunity to noise.

Performance Evaluation Of Cooperative Communications For Stfc Mb-Ofdm Uwb, Zixuan Lin, Le Chung Tran, Farzad Safaei

Faculty of Engineering and Information Sciences - Papers: Part A

Recently, the combination of cooperative communication, Space-Time-Frequency Codes (STFCs) and Multiband OFDM Ultra-Wideband (MB-OFDM UWB) has been proposed to improve the data rate, system capacity and reliability. This paper provides insightful performance evaluation for our previous proposed cooperative communication schemes for MBOFDM UWB systems. In particular, this paper shows that the usefulness of cooperative communication schemes is decided by the mutual relation between the signal-to-noise ratio (SNR) of the inter-node links, referred to as inter-node SNR, and that of the uplinks, which is referred to as uplink SNR. For a certain uplink SNR value, cooperative communication becomes useful when the …

An Image-Based Approach For Classification Of Human Micro-Doppler Radar Signatures, Fok Hing Chi Tivive, Son Lam Phung, Abdesselam Bouzerdoum

Faculty of Engineering and Information Sciences - Papers: Part A

With the advances in radar technology, there is an increasing interest in automatic radar-based human gait identification. This is because radar signals can penetrate through most dielectric materials. In this paper, an image-based approach is proposed for classifying human micro-Doppler radar signatures. The time-varying radar signal is first converted into a time-frequency representation, which is then cast as a two-dimensional image. A descriptor is developed to extract micro-Doppler features from local time-frequency patches centered along the torso Doppler frequency. Experimental results based on real data collected from a 24-GHz Doppler radar showed that the proposed approach achieves promising classification performance.

Realizing Fully Secure Unrestricted Id-Based Ring Signature In The Standard Model Based On Hibe, Man Ho Au, Joseph K. Liu, Willy Susilo, Jianying Zhou

Faculty of Engineering and Information Sciences - Papers: Part A

We describe a secure and unrestricted identity-based ring signature scheme in the standard model. Our construction is provably fully secure in the standard model under static assumptions and is motivated by an existing HIBE scheme. Our observation on the relationship between ID-based ring signatures and HIBE is of interest to researchers in other fields as well. Following the strongest anonymity definition in ring signatures, we define a new level of anonymity for ID-based ring signatures in which the attacker can specify the randomness used in the creation of the user secret key, in addition to the private key generators master …

Secure Rfid Ownership Transfer Protocols, Nan Li, Yi Mu, Willy Susilo, Vijay Varadharajan

Faculty of Engineering and Information Sciences - Papers: Part A

An RFID tag could change hands many times during its lifetime. In a retail chain, the ownership of the tag is instituted by the supplier who initially owns the tag. In the view of a buyer, the validity of the current tag ownership and the originality of supplier are most important. In typical RFID ownership transfer protocols, the knowledge of the tag's authentication key proves the ownership. However, it is insufficient against an active attacker, since tags are usually lack of tamper-proof protections. Ownership transfer relies on a successful verification of tag's supplier and current ownership. In this paper, we …

Systematic Network Design For Liner Shipping Services, Shuaian Wang, Zhiyuan Liu, Qiang Meng

Faculty of Engineering and Information Sciences - Papers: Part A

A systematic design for a liner shipping network was addressed. Many practical features in real-world operations, including multiple types of containers, container transshipment operations, empty container repositioning, origin-to-destination transit time constraints, consistent services with the current network, and joint services with other liner shipping companies, were considered. Given a set of candidate ship routes, some of these routes had to be used, and the use of others was optional. A mixed-integer linear programming model was proposed for the selection of optional ship routes. The solution of this model provided the laden and empty container flow on the selected ship routes. …

Simplified Boundary Element Method For Kinematic Response Of Single Piles In Two-Layer Soil, Fayun Liang, Haibing Chen, Wei Dong Guo

Faculty of Engineering and Information Sciences - Papers: Part A

A simple approach is formulated to predict the elastic, kinematic pile bending during harmonic or transient excitation for a circular pile (rather than a simplified thin strip). The kinematic response of a pile embedded in two-layer soil is resolved in the frequency domain caused by the upward propagation of shear waves from the underlying bedrock. The simplified approach is generally valid to nonhomogeneous soil profiles, in light of the good comparison with the dynamic FE method and BDWF solution. It employs the soil-displacement-influence coefficients Is to consider the pile-soil interaction (resembling the spring constant kx in the BDWF) and provides …

Does Health Capital Have Differential Effects On Economic Growth?, Arusha V. Cooray

Faculty of Commerce - Papers (Archive)

Investigating the impact of health capital disaggregated by gender on economic growth in a sample of 210 countries over the 1990-2008 period, this study suggests that the influence of health capital across countries cannot be generalised. Results for the full sample indicate that health capital does not have a robust and significant effect on economic growth unless through their interactions with health expenditure and education. The results disaggregated by income group reveal that health capital has a positive robust influence on economic growth in high and upper middle income economies. In low and low middle income economies, health capital gains …

A Template For Integrated Reporting, Indra Abeysekera

Faculty of Commerce - Papers (Archive)

Purpose – This paper sets out to outline the concept of integrated reporting and to propose a template for integrated reporting in organisations.

Design/methodology/approach – The approach to the conceptual model is founded on concepts proposed on integrated reporting by the King Report on Governance for South Africa (King III), and the International Integrated Reporting Council in the U.K.

Findings – The integrated report should explain the story of reaching the organisation’s vision, underpinned by its values, enacted by management, monitored by governance, and using facets of resources relating to financial capital, intellectual capital, social capital, and environmental capital.

Practical …

Extending The Use Of Market Orientation: Transforming A Charity Into A Business, Paul A. Chad

Faculty of Commerce - Papers (Archive)

Charities play a crucial role within society but are facing growing competition. Adopting a market orientation assists for-profit organisations to improve performance and can potentially also assist charities. This paper examines the under-researched topic of how market orientation can be appropriately introduced into a charity, and the resultant effect upon performance. A charity that introduced market orientation is examined using a discourse transformation framework. Thematic analysis of in-depth interviews of employees identifies how management changed the organisation through use of a three-phase process of new managerialism, professionalism and embedding. Few if any papers have previously examined how management of a …

Application Of The Task-Technology Fit Model To Structure And Evaluate The Adoption Of E-Books By Academics, John D'Ambra, Concepcion S. Wilson, Shahriar Akter

Faculty of Commerce - Papers (Archive)

Increasingly, e-books are becoming alternatives to print books in academic libraries, thus providing opportunities to assess how well the use of e-books meets the requirements of academics. This study uses the task-technology fit (TTF) model to explore the interrelationships of e-books, the affordances offered by smart readers, the information needs of academics, and the "fit" of technology to tasks as well as performance. We propose that the adoption of e-books will be dependent on how academics perceive the fit of this new medium to the tasks they undertake as well as what added-value functionality is delivered by the information technology …

Wollongong In Posters: Art On A Telegraph Pole [Catalogue], Rebecca Daly, Michael K. Organ, Pia Petre

Senior Deputy Vice-Chancellor and Deputy Vice-Chancellor (Education) - Papers

Brief introduction to, and catalogue of works in the Wollongong in Posters: Art on a Telegraph Pole exhibition held at the Panizzi Room, University of Wollongong Library, 8 July - 9 August 2013.

Internationalize Your Professional Network, Christine F. Smith, Clare B. Mckenzie, Kate Byrne, Alyson Dalby

Senior Deputy Vice-Chancellor and Deputy Vice-Chancellor (Education) - Papers

The article discusses the internationalization of a librarian's professional network which can be beneficial to the librarian and the library in Canada. It states that international librarianship can help one build a global support system through mutual learning from each other, and can help one better understand Canada's multicultural and multilingual environment. The International Librarians Network (ILN) initiative reportedly aims to help librarians develop international networks.

Greetings From Cala: Christian Librarians In Africa, Ephraim Mudave

The Christian Librarian

No abstract provided.

Goals, Motivation For, And Outcomes Of Personal Learning Through Networks: Results Of A Tweetstorm, Rory L. Sie, Nino Pataraia, Eleni Boursinou, Kamakshi Rajagopal, Anoush Margaryan, Isobel Falconer, Marlies Bitter-Rijpkema, Allison Littlejohn, Peter Sloep

Senior Deputy Vice-Chancellor and Deputy Vice-Chancellor (Education) - Papers

Recent developments in the use of social media for learning have posed serious challenges for learners. The information overload that these online social tools create has changed the way learners learn and from whom they learn. An investigation of learners' goals, motivations and expected outcomes when using a personal learning network is essential since there have been few empirical studies in the domain. Previous research focused on the factors that influence learning in virtual environments, but these studies were mainly conducted in an era in which online social media were not yet used for personal learning networks. The current paper …

Development Of Adaptive Seismic Isolators For Ultimate Seismic Protection Of Civil Structures, Jianchun Li, Yan-Cheng Li, Weihua Li, Bijan Samali

Faculty of Engineering and Information Sciences - Papers: Part A

Base isolation is the most popular seismic protection technique for civil engineering structures. However, research has revealed that the traditional base isolation system due to its passive nature is vulnerable to two kinds of earthquakes, i.e. the near-fault and far-fault earthquakes. A great deal of effort has been dedicated to improve the performance of the traditional base isolation system for these two types of earthquakes. This paper presents a recent research breakthrough on the development of a novel adaptive seismic isolation system as the quest for ultimate protection for civil structures, utilizing the field-dependent property of the magnetorheological elastomer (MRE). …

Electromagnetically Induced Transparency Of Charge Pumping In A Triple-Quantum-Dots With Λ-Type Level Structure, Chun Guan, Yunhui Xing, Chao Zhang, Zhongshui Ma

Faculty of Engineering and Information Sciences - Papers: Part A

We demonstrate an electromagnetically induced electron transparency (EIET) in electron transport through a coupled triple-quantum-dots system under two radiation fields. The direct evidence of EIET is that an electron can travel from the left dot to the right dot without any effect from the center dot. The EIET (position, height, and symmetry) can be tuned by several controllable parameters of the radiation fields, such as the Rabi frequencies and detuning frequencies. The result offers a resonant transport tuning technique using radiation fields.

Dynamic Testing Of Tekseal High Yield Grout To Provide An Orepass Plug Designed For Impact, I V. S Mutton, Alexander Remennikov, D Pateman

Faculty of Engineering and Information Sciences - Papers: Part A

Significant wear in orepasses particularly in the brow and chute areas is proportional to the tonnage throughput with increased wear associated with running orepasses empty. During planned shutdowns it may be necessary to isolate maintenance crews from objects falling from orepasses. In the last 15 years grout orepass plugs that can later be easily removed have been poured above chute maintenance areas. These provide protection from high energy impact and isolating workers from the hazard. Construction and removal methods will be briefly explained. Since it is not feasible to investigate the problem of orepass plug impact response using full-scale experimental …

Enhanced Biological Phosphorus Removal And Its Modeling For The Activated Sludge And Membrane Bioreactor Processes, M F. R Zuthi, W S. Guo, H H. Ngo, L D. Nghiem, F I. Hai

Faculty of Engineering and Information Sciences - Papers: Part A

A modified activated sludge process (ASP) for enhanced biological phosphorus removal (EBPR) needs to sustain stable performance for wastewater treatment to avoid eutrophication in the aquatic environment. Unfortunately, the overall efficiency of the EBPR in ASPs and membrane bioreactors (MBRs) is frequently hindered by different operational/system constraints. Moreover, although phosphorus removal data from several wastewater treatment systems are available, a comprehensive mathematical model of the process is still lacking. This paper presents a critical review that highlights the core issues of the biological phosphorus removal in ASPs and MBRs while discussing the inhibitory process requirements for other nutrients' removal. This …

Description And Comparison Of Quality Of Electronic Versus Paper-Based Resident Admission Forms In Australian Aged Care Facilities, Ning Wang, Ping Yu, David Hailey

Faculty of Engineering and Information Sciences - Papers: Part A

Purpose To describe the paper-based and electronic formats of resident admission forms used in several aged care facilities in Australia and to compare the extent to which resident admission information was documented in paper-based and the electronic health records. Methods Retrospective auditing and comparison of the documentation quality of paper-based and electronic resident admission forms were conducted. A checklist of admission data was qualitatively derived from different formats of the admission forms collected. Three measures were used to assess the quality of documentation of the admission forms, including completeness rate, comprehensiveness rate and frequency of documented data element. The associations …

A High Performance Peer To Cloud And Peer Model Augmented With Hierarchical Secure Communications, Zhe Sun, Jun Shen

Faculty of Engineering and Information Sciences - Papers: Part A

This paper presents a secure storage model named Peer to Cloud and Peer (P2CP). P2CP uses the cloud storage system as a backbone storage system. However, when data transmission occurs, the data nodes, cloud user, and the non-cloud user are involved to complete the transaction all together. The users, typically the client peers, can communicate with each other directly, thus bypassing servers on the cloud. Similarly, cloud servers can communicate with each other in a P2P mode. We also introduce a "hierarchy security" method to guarantee the data security in the proposed P2CP storage model. A key feature of our …

Algorithm Portfolios For Logistics Optimization Considering Stochastic Demands And Mobility Allowance, N Shukla, A K. Choudhary, P Prakash, K J. Fernandes, M K. Tiwari

Faculty of Engineering and Information Sciences - Papers: Part A

The vehicle routing problem with stochastic demand (VRPSD) is a well known NP-hard problem. The uncharacteristic behaviour associated with the problem enhances the computational efforts required to obtain a feasible and near-optimal solution. This paper proposes an algorithm portfolio methodology based on evolutionary algorithms, which takes into account the stochastic nature of customer demand to solve this computationally complex problem. These problems are well known to have computationally complex objective functions, which make their solutions hard to find, particularly when problem instances of large dimensions are considered. Of particular importance in such situations is the timeliness of the solution. For …

A Sax-Based Advanced Computational Tool For Assessment Of Clustered Rooftop Solar Pv Impacts On Lv And Mv Networks In Smart Grid, M J. E Alam, K M. Muttaqi, D Sutanto

Faculty of Engineering and Information Sciences - Papers: Part A

Future distribution networks with increasing level of solar PV penetration will be managed using smart grid technologies capable of producing appropriate and timely response during normal and abnormal operational events. Distribution feeder loads vary throughout the day according to the trend of consumption of the customers. Solar PV outputs fluctuate in proportion to irradiance level of sun. Simultaneous occurrence of both of these variations would result in various operating conditions that may lead to unexpected events, and would require a large amount of network data to be processed and analyzed for decision making. It is envisaged that such data will …

A Mathematical Function To Represent S-Shaped Relationships For Geotechnical Applications, Martin D. Liu, K J. Xu, Suksun Horpibulsuk

Faculty of Engineering and Information Sciences - Papers: Part A

In this paper a new mathematical function is proposed for describing the S-shape relationship in both normal x and y scale and the semi-logarithmic x and y scale. Basic features of the proposed function have been demonstrated. The proposed function has then been used to simulate the S-shape relationship for seven categories of engineering phenomena. It is seen that the proposed mathematical function has a great potential for representing various S-shape relationships and provides a powerful tool for characterising properties of materials or response of systems; it is thus useful for further numerical analysis.

Understanding The Factors Controlling The Removal Of Trace Organic Contaminants By White-Rot Fungi And Their Lignin Modifying Enzymes: A Critical Review, Shufan Yang, Faisal I. Hai, Long D. Nghiem, William E. Price, Felicity Roddick, Maria T. Moreira, Saleh F. Magram

Faculty of Engineering and Information Sciences - Papers: Part A

White-rot fungi (WRF) and their lignin modifying enzymes (LME) can degrade a wide range of trace organic contaminants (TrOC), which are suspected to cause adverse health effects in humans and other biota. Recent studies have successfully applied either whole-cell WRF or their extracellular culture extract to remove TrOC from the aqueous phase. TrOC removal by a WRF system is dependent on a range of factors including molecular structure of the TrOC, fungal species and their specific LME, culture medium composition, and methods to enhance fungal degradation capacity; however, the specific relationships between these factors have not been systematically delineated. The …

Microstrength, Strength And Microstructure Of Carbonaceous Materials, Xing Xing, Guangqing Zhang, George Ciezki, Mark Dell'amico, Oleg Ostrovski

Faculty of Engineering and Information Sciences - Papers: Part A

The effect of heat treatment at 700-1500 ºC on the mechanical strength, micro strength and pore structure of carbonaceous materials, including coke, char and coals, were studied using tensile test, ultra micro indentation and image analysis. Strength of chars and pyrolysed coals was strongly enhanced by heat treatment at temperature below 1100 °C; strength of cokes was slightly degraded after heat treatment at 1500 °C. Mechanical strength of carbonaceous materials was demonstrated to be significantly affected by micro strength and porosity. Micro strength of chars and coals was significantly enhanced by heat treatment, whereas micro strength of cokes was only …

Carbothermal Reduction Of Silica In Nitrogen And Nitrogen-Hydrogen Mixture, Xiaohan Wan, Guangqing Zhang, Oleg Ostrovski, Hal Aral

Faculty of Engineering and Information Sciences - Papers: Part A

Carbothermal reduction of silica was investigated in a fixed bed reactor at 1300-1650 °C in nitrogen at 1-11 atm pressure and in hydrogen-nitrogen mixtures at atmospheric pressure. Samples were prepared from silica-graphite mixtures in the form of pellets. CO evolution in the reduction process was monitored using an infrared sensor; oxygen, nitrogen and carbon contents in reduced samples were determined by LECO analyses. Phases formed in the reduction process were analysed by XRD. Silica was reduced to silicon nitride and silicon carbide; their ratio was dependent on reduction time, temperature and nitrogen pressure. Reduction products also included SiO which was …

Analytical Solutions For Filtration Process Based On Constriction Size Concept, Vo Trong Nguyen, Cholachat Rujikiatkamjorn, Buddhima Indraratna

Faculty of Engineering and Information Sciences - Papers: Part A

An analytical model is proposed to describe the filtration process applicable to a base soil-filter system. The Navier-Stokes equations for porous media are used to capture the hydrodynamic behavior, whereas, numerically, a new algorithm is proposed to solve the Navier-Stokes equation in a nonlinear form. The various mixtures of base soil particles eroded and water flow within the system are computed using the workenergy principle incorporating the constriction size of the filter.The model can assess the filtration process through the flowrate and the accumulation and redistribution of fine particles within the filter. By discretizing the base soil and filter domains …

An Adaptive Bilateral Negotiation Model Based On Bayesian Learning, Chao Yu, Fenghui Ren, Minjie Zhang

Faculty of Engineering and Information Sciences - Papers: Part A

Endowing the negotiation agent with a learning ability such that a more beneficial agreement might be obtained is increasingly gaining attention in agent negotiation research community. In this paper, we propose a novel bilateral negotiation model based on Bayesian learning to enable self-interested agents to adapt negotiation strategies dynamically during the negotiation process. Specifically, we assume that two agents negotiate over a single issue based on time-dependent tactic. The learning agent has a belief about the probability distribution of its opponent's negotiation parameters (i.e., the deadline and reservation offer). By observing opponent's historical offers and comparing them with the fitted …

Alternative Al Production Methods: Part 2 - Thermodynamic Analyses Of Indirect Carbothermal Routes, M A. Dewan, M A. Rhamdhani, G A. Brooks, B J. Monaghan, L Prentice

Faculty of Engineering and Information Sciences - Papers: Part A

It has been widely claimed that direct and indirect carbothermic reduction of alumina for the production of aluminium have the potential to consume less energy, generate fewer perfluorocarbons and have lower total greenhouse gas emissions compared to the Hall-He´ roult process. A review of alternative aluminium production techniques focusing on the indirect carbothermal reduction routes has been presented in the Part 1 paper. In this Part 2 paper, systematic thermodynamic analyses of indirect carbothermal reduction routes are presented. These include the analyses of the Stage 1 of the process where alumina is converted to intermediate aluminium compounds before they are …